LAKE FOREST, Ill.—Chicago Bears quarterback Jay Cutler will not play Monday night against the San Francisco 49ers because of the concussion he suffered Sunday in a 13-6 loss to the Houston Texans, the Bears announced Friday morning via Twitter.

Jason Campbell will play against the 49ers. Campbell, a former Oakland Raider, has a career passer rating of 82.6. Cutler's career rating is 84.1.

Campbell's last start came for Oakland in Week 6 last year when he went 6-of-9 for 52 yards against Cleveland, before suffering a broken collarbone. Campbell had a passer rating of 84.2 for the Raiders last season.

The Bears have won 14 of the last 19 games Cutler has started. Without Cutler in the lineup, they are 2-5 since he came to the team in 2009. Last year, they went 1-5 to close the season without him, as Caleb Hanie and Josh McCown replaced him unsuccessfully. They won a game in 2010 with Todd Collins starting in Cutler's place.

Campbell doesn't have Cutler's mobility, and it's a big factor considering the Bears' offensive line has been one of the worst in the league in pass protection. Only five teams have allowed more than the 26 sacks the Bears have permitted this season.

With a week of practice, the Bears hope Campbell improves over his relief appearance in Week 10. Campbell completed 11 of 19 attempts for 94 yards in the loss to Houston, but he rarely threw downfield. Campbell seemed more concerned with not making a mistake rather than making plays.

Campbell will face another top-notch defense in San Francisco, and the Bears (7-2) will be hard-pressed to generate offense unless Campbell is more aggressive and more effective.